According to Endometriosis.org, even though there is still no known cause of what triggers endometriosis, research has been evolving and discovering possible causes for it. Check out this list of six possible causes for endometriosis.

1. Metaplasia

When a normal type of tissue changes to another type of tissue, metaplasia happens. There are times when the endometrial tissue can, in some cases, replace other types of tissues outside the uterus.